NOVELTY - Foil comprises layers made of a molding composition, comprising (a) a first outer layer comprising a polyamide content (at least 35 wt.%), (b) a middle layer comprising a polymer content (at least 50 wt.%), and (c) a second outer layer comprising a polyamide content (at least 35 wt.%), where the molding composition comprises polyamide (30-95 pts. wt.) and polyolefin (5-70 pts. wt.) and the layers (a), (b), and (c) are successively arranged. An adhesion modification of the composite film is carried out using polyamide elastomer as the polyamide component of the layers (a), (b), and (c).    USE - The foil is useful as a rear cover of a photovoltaic module (claimed).    ADVANTAGE - The foil contains the polyamide component, which provides improved adhesion to the sealing layer and improves adhesion between pure polyamide-based coatings and the coating containing polyamide and polyolefin, and ensures protection against mechanical and weather-related influences in photovoltaic modules.    DETAILED DESCRIPTION - Foil comprises layers including (a) a first outer layer made of a molding composition comprising a polyamide content (at least 35 wt.%), (b) a middle layer made of the molding composition comprising a polymer content (at least 50 wt.%), where the molding composition comprises polyamide (30-95 pts. wt.) and polyolefin (5-70 pts. wt.), and (c) a second outer layer made of the molding composition, which includes a polyamide content (at least 35 wt.%). The layers (a), (b), and (c) are successively arranged. An adhesion modification of the composite film is carried out by (i) using a polyamide elastomer including polyether ester amide and polyetheramide, as the polyamide component of the layer (a) such that the molding composition of the layer (a) contains polyamide elastomer (1-25 wt.%); (ii) using the polyamide elastomer including polyether ester amide and polyetheramide, as the polyamide component of the layer (b) such that the molding composition of the layer (b) contains polyamide elastomer (1-15 wt.%); and (iii) using the polyamide elastomer including polyether ester amide and polyetheramide, as the polyamide component of the layer (c) such that the molding composition of the layer (c) contains polyamide elastomer (1-25 wt.%). An INDEPENDENT CLAIM is also included for a photovoltaic module comprising the above mentioned film as a rear cover, where the layer (a) is connected with a sealing layer, in which a solar cell is embedded.