For the Ag/Pd(111) systems, the surface energy of the Ag1L system resembles more those of the other Ag film terminated surfaces and of the pure Ag surfaces, while for the Ag/Pt(111) systems there is a significant difference. Obviously, for Ag/Pd(111) these long-range effects are much weaker than for the corresponding Ag/Pt(111) system. The two surface alloys are higher in surface energy than the Ag film systems, although the difference is not as pronounced as in the Ag/Pt(111) systems. This difference can be understood from the weaker Ag -Pd interactions that have to be broken during cleavage as compared to the Ag -Pt interactions. In general, the calculated surface energies of the Pt-terminated surfaces with their fixed bulk positions are very close to those of the corresponding Pt(111) and Pd(111) surfaces (Fig. and Table ).