Polymer-supported　metal　films　as　interconnects　for　flexible,　large　area　electronics　may　rupture　when　they　are　stretched,　and　the　rupture　strain　is　strongly　dependent　upon　the　film/substrate　interfacial　properties.　This　paper　investigates　the　influence　of　interfacial　properties　on　the　ductility　of　polymer-supported　metal　films　by　modeling　the　microstructure　of　the　metal　film　as　well　as　the　film/substrate　interface　using　the　method　of　finite　elements　and　the　cohesive　zone　model　(CZM).　The　influence　of　various　system　parameters　including　substrate　thickness.　Young＇s　modulus　of　substrate　material,　film/　substrate　interfacial　stiffness,　strength　and　interfacial　fracture　energy　on　the　ductility　of　polymer-supported　metal　films　is　systematically　studied.　Obtained　results　demonstrate　that　the　ductility　of　polymer-supported　metal　films　increases　as　the　interfacial　strength　increases,　but　the　increasing　trend　is　affected　distinctly　by　the　interfacial　stiffness.　(C)　2010　Elsevier　Ltd.　All　rights　reserved.