In the present article there are under the consideration the possibilities of improving the structural and thermodynamic stabilities of metal/2D-crystal interface state, that are determined the fundamental characteristics of the layered and matrix metal/graphene and silicene nanocomposites (Me/2D-G и Me/2D-Si; Me: Al, Mg, Ir, Pd, Ru, Ni, Ti, Ag) produced by pre-operational graphene (silicene) nanoparticle dispersion or in the frame of the additive 3D typing technology (vapor-gas synthesis or CVD) with layered metal atom deposition (or as the crystalline/amorphous nanofilms) on graphene or silicene planes (1 or few lays) as substrates. The systematical analysis of the experimental available data and the original theoretical results received with combined DFT and molecular dynamics methods and concerning with nanocomposites displayed the specific structures, mechanical strength and unique electronic properties.