Finally, the data also illustrate the magnitude of possible discrepancies when determining the surface energy of the deposit side of an asymmetric bimetallic Ag/Pt(111) slab via assuming the surface energy of Pt(111) for the bottom side. energies Ef of these bimetallic systems, we can use the approach described in eqs. (8). Normalizing to the number of surface metal atoms ns we obtain for the bulk formation energy Ef,bulk