Multi-layer sheet comprising a protective polyurethane layer

Multilayer sheet comprising a polymeric film having on a first major side a cross-linked polyurethane layer having an E-modulus of at least 750 N/mm2, a tensile strength at break between 22 and 44 N/mm2 and an elongation at break of 30 to 140%, the major part of said cross-linked polyurethane layer comprising a polycarbonate based polyurethane containing acid groups and cross-linked with a crosslinker, the polycarbonate based polyurethane comprising the reaction product of a polycarbonate polyol or a polycarbonate polyamine and an aliphatic polyisocyanate and the polycarbonate based polyurethane, when not cross-linked with said crosslinker, having a Koenig hardness of at least 150 seconds, said sheet being sized and shaped to conform to a surface of an automobile.