We consider the adsorption of P-and M- [6]H on Au(111) and Cu(111) substrates functionalized with one to four adatoms. Helicene dimers, also discussed here for one-and three-adatom systems, will be denoted as MM , PP or MP , based on the stereochemical designation of the two enantiomers. Gas phase structures of [6]C and [6]H optimized in a PBE-TS/DZP framework were used to create input geometries for the surface-supported systems. Figure presents the optimized structures.