NOVELTY - A transparent multilayer film comprises: A) a first film layer comprising a fluorinated copolymer resin composition where i) the fluorinated copolymer comprises copolymerized units of tetrafluoroethylene and copolymerized units of comonomers selected from ethylene, and/or perfluorinated comonomer, and ii) at least one surface of the first film layer has been modified by a surface treatment; and B) a second film layer consisting of ethylene copolymer ionomer blend. The surface of the second film layer is adhered to the modified surface of the first film layer.    USE - As transparent multilayer film for preparing photovoltaic module (claimed).    ADVANTAGE - The encapsulant materials exhibit a combination of good adhesion to fluoropolymer layers, particularly under adverse conditions, and high light transmittance, thereby enabling development of improved photovoltaic modules. The method provides multilayer films and photovoltaic modules having average peel strength between the first film layer and the second film layer of greater than 1 (preferably greater than 5) lbf/in, measured after exposing the film or photovoltaic module to conditions of 85 degrees C at 85% relative humidity (damp heat) for 1000 hours.    DETAILED DESCRIPTION - A transparent multilayer film comprises: A) a first film layer comprising a fluorinated copolymer resin composition where i) the fluorinated copolymer comprises copolymerized units of tetrafluoroethylene and copolymerized units of comonomers selected from ethylene, and/or perfluorinated comonomer, and ii) at least one surface of the first film layer has been modified by a surface treatment; and B) a second film layer consisting of a blend composition, where the blend composition comprises (wt.%) ethylene copolymer (I) (10-90) and ethylene copolymer (II) (10-90); where the ethylene copolymer (I) consists of copolymerized units of ethylene, optionally copolymerized units (10-40) of a first olefin having a formula of CH2=C(R1)CO2R2, and copolymerized units (2-30) of a second olefin having a formula of CH2=C(R3)COOH, where the weight percentages of the copolymerized units of the first olefin and of the second olefin are based on the total weight of the copolymer (I); where 10-90 wt.% of the carboxylic acid groups are neutralized to form carboxylate salts. The ethylene copolymer (II) consists of copolymerized units of ethylene, optionally copolymerized units (20-40 wt.%) of the first olefin, and copolymerized units (3-15 wt.%) of a third olefin having a formula of CH2=C(R4)-D', where the weight percentages of the copolymerized units of the first olefin and of the third olefin are based on the total weight of the copolymer (II). The surface of the second film layer is adhered to the modified surface of the first film layer.    R1-R3=H or an alkyl;    R4=H or an alkyl group;    D'=moiety selected from -CO2R5, -CO2R6-R5, -R6-R5, -O-R5 or -R5;    R5=a moiety containing an epoxy group;    R6=alkylene group.    Provided that none of the first, second or third olefins is a dicarboxylic acid or a di-ester, mono-ester or anhydride of the dicarboxylic acid. INDEPENDENT CLAIMS are included for the following:    (1) preparing the transparent multilayer film involving providing the first film layer; providing the second film layer; contacting a surface of the second film layer with the modified surface of the first film layer; and adhering the first film layer to the second film layer by the application of heat and optionally pressure or vacuum;    (2) preparing a photovoltaic module, involving: providing a solar cell layer; providing a multilayer film laminate that is larger in area than the solar cell layer; overlaying the solar cell layer with the multilayer film laminate such that i) the surface of the second layer of the multilayer film laminate contacts the solar cell layer; ii) a portion of the second layer of the multilayer film laminate extends beyond the perimeter of the solar cell layer; and iii) the portion of the second layer of the multilayer film laminate that extends beyond the perimeter of the solar cell layer contacts another layer that is an encapsulant layer; and adhering the second layer of the multilayer film laminate to the encapsulant layer by the application of heat and optionally pressure or vacuum to provide a photovoltaic module.