TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The melt-processable copolymer, which is first optical layer, comprises: copolymers of tetrafluoroethylene, hexafluoropropylene and vinylidene fluoride; copolymers of hexafluoropropylene, tetrafluoroethylene and ethylene; copolymers of tetrafluoroethylene and propylene; copolymers of tetrafluoroethylene and norbornene; or copolymers of ethylene and tetrafluoroethylene. The optical stack comprises layer pairs consisting of: poly(methyl methacrylate) and (copolymers of tetrafluoroethylene, hexafluoropropylene, and vinylidene fluoride) layer pairs; poly(methyl methacrylate) and (copolymers of hexafluoropropylene, tetrafluoroethylene, and ethylene) layer pairs; polycarbonate and (copolymers of tetrafluoroethylene, hexafluoropropylene, and vinylidene fluoride) layer pairs; polycarbonate and (copolymers of hexafluoropropylene, tetrafluoroethylene, and ethylene) layer pairs; polycarbonate and (copolymers of ethylene and tetrafluoroethylene) layer pairs; copolymers of polypropylene and (copolymers of tetrafluoroethylene, hexafluoropropylene, and vinylidene fluoride) layer pairs; polypropylene and (copolymers of hexafluoropropylene, tetrafluoroethylene, and ethylene) layer pairs; polystyrene and (copolymers of tetrafluoroethylene, hexafluoropropylene, and vinylidene fluoride) layer pairs; copolymers of polystyrene and (copolymers of tetrafluoroethylene, hexafluoropropylene, and vinylidene fluoride) layer pairs; copolymers of polystyrene and (copolymers of hexafluoropropylene, tetrafluoroethylene, and ethylene) layer pairs; copolymers of polyethylene and (copolymers of tetrafluoroethylene, hexafluoropropylene, and vinylidene fluoride) layer pairs; copolymers of polyethylene and (copolymers of hexafluoropropylene, tetrafluoroethylene, and ethylene) layer pairs; cyclic olefin copolymers and (copolymers of tetrafluoroethylene, hexafluoropropylene, and vinylidene fluoride) layer pairs; cyclic olefin copolymers and (copolymers of hexafluoropropylene, tetrafluoroethylene, and ethylene) layer pairs; and/or thermoplastic polyurethane and (copolymers of tetrafluoroethylene, hexafluoropropylene, and vinylidene fluoride) layer pairs. The melt-processable copolymer comprising interpolymerized monomers of tetrafluoroethylene comprises three additional different monomers. The optical stack transmits or reflects: at least a portion of the wavelengths at 400-700 nm; at least a portion of the wavelengths at greater than 700 nm; at least a portion of the wavelengths at less than 300 nm; or at least a portion of the wavelengths at 300-400 nm. The multilayer optical film further comprises: printing; an adhesive; a tear resistant layer; an UV-absorbing layer; a skin layer; or a protective boundary layer. The multilayer optical film further comprises an UV-absorbing compound and/or an infrared absorbing compound. The melt-processable copolymer, the non-fluorinated polymeric material or an optional additional layer comprises the UV-absorbing compound and/or infrared-absorbing compound. The multilayer optical film further comprises a functional additive, optionally, where the functional additive is a processing additive. The optical stack comprises at least 5 first optical layers and at least 5 second optical layers, preferably at least 50 first optical layers and at least 50 second optical layers. The multilayer optical film is disposed between at least two panes of glass. Preferred method: The method further comprises: coextruding the first optical layer and the second optical layer into a web; layering a sheet of either the first optical layer onto the second optical layer or a sheet of the second optical layer onto the first optical layer, then laminating; coating a solution of either the first optical layer onto the second optical layer or the second optical layer onto the first optical layer; and/or vapor depositing either the first optical layer onto the second optical layer or the second optical layer onto the first optical layer. EXAMPLE - Poly(methyl methacrylate) delivered by one extruder at a rate of 10 pounds per hour, copolymer of tetrafluoroethylene, hexafluoropropylene, and vinylidene fluoride delivered by another extruder at a rate of 17 pounds per hour, and poly(methyl methacrylate) for the skin layers delivered by a third extruder at a rate of 10 pounds per hour, were coextruded through a multilayer polymer melt manifold to create a multilayer melt stream having 61 layers with poly(methyl methacrylate) skin layers. This multilayer coextruded melt stream was cast onto a chill roll at 4 m/minute. The multilayer cast web was stretched using a laboratory stretching device. A 4 inch square of the multilayer cast web was placed into the stretching frame and heated in an oven at 140 degrees C in 55 seconds. The multilayer cast web was then stretched at 25%/second until the web was stretched to about 3x 3 times the original dimensions. Immediately after stretching, the multilayer optical film was taken out of the stretching device and cooled at room temperature.