NOVELTY - Multilayer optical film (100) comprises an optical stack (140) containing: many first optical layers; and many second optical layers disposed in a repeating sequence with the first optical layers.    USE - The multilayer optical film is useful in a coating and an article including UV mirror, infrared mirror or visible mirror, which is useful in: solar power applications; lighting applications; fenestration products (all claimed); architectural applications; and greenhouse applications.    ADVANTAGE - The multilayer optical film has: improved performance compared to traditional multilayer optical films; enhanced reflectance and/or transmissive performance or visual characteristics; and non- or reduced flammability, improved corrosion resistance, and/or improved UV- and weathering-stability.    DETAILED DESCRIPTION - Multilayer optical film (100) comprises an optical stack (140) containing: many first optical layers; and many second optical layers disposed in a repeating sequence with the first optical layers. Each first optical layer comprises a melt-processable copolymer comprising interpolymerized monomers of tetrafluoroethylene, with the proviso that the melt-processable copolymer is not a fluorinated ethylene-propylene copolymer per ASTM D 2116-07 or a perfluoroalkoxy resin per ASTM D 3307-08. Each second optical layer comprises a nonfluorinated polymeric material consisting of: poly(methyl methacrylate); copolymers of poly(methyl methacrylate); polypropylene; copolymers of propylene; polystyrenes; copolymers of styrene; polyvinylidene chloride; polycarbonates; thermoplastic polyurethanes; copolymers of ethylene; and/or cyclic olefin copolymers. INDEPENDENT CLAIMS are also included for:    (1) an article comprising the multilayer optical film;    (2) a coating comprising small pieces of the multilayer optical film, where the largest dimension of each piece is at least twice the thickness of the multilayer optical film and not more than the maximum thickness of the coating; and    (3) a method of making the multilayer optical film, comprising providing the first and second optical layers and alternating the optical layers to construct many layers.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic side view of multilayer optical film.    Multilayer optical film (100)    Optional protective boundary layers (120,122)    Optional skin layers (130,150)    Optical stack (140)