Alternatively, these surface energies can also be determined by cleaving the symmetric 12-layer slab (Eslab,12L) into two 6-layer slabs (Eslab,6L). Depending on the choice of the 12-layer slab, this yields either the surface energy of the relaxed deposit surface (symmetric Pt-terminated 12-layer slab) or the unrelaxed substrate surface (symmetric Ag-terminated 12-layer slab).