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We discuss the possibility of a 2D ordered structure formed upon depositionof Si on metal surfaces. We investigate the atomic and electronic structure ofthe Si-$(\sqrt{19}\times\sqrt{19})R23.4^{\circ}$/Pt(111) surface reconstructionby means of a set of experimental surface-science techniques supported bytheoretical calculations. The theory achieves a very good agreement with theexperimental results and corroborate beyond any doubt that this phase is asurface alloy consisting of Si$_3$Pt tetramers that resembles a twisted Kagomelattice. These findings render unlikely any formation of silicene or germaneneon Pt(111) and other transition metal surfaces.

physical review. b, condensed matter and materials physics

Silicene vs. ordered 2D silicide: the atomic and electronic structure of  the Si-$(\sqrt{19}\times\sqrt{19})R23.4^{\circ}$/Pt(111) surface  reconstruction