the invention provides a stratiform press sheet useful in laminating three - dimensional flexible printed circuits on a flat bed press , the sheet having a median conformable layer comprising a polymeric thermoplastic film ; a polymeric release layer ; a stabilizing layer made of a sheet of metal foil ; and adhesive means to bond the above components in a single , stratiform sheet . the metal foil is functional at both the conventional lower laminating temperatures and the higher temperatures approaching 600 degrees f ., and accordingly by careful selection of the other components it is possible to provide unified stratiform press pad sheets accommodating a wide range of laminating temperatures .