For the configuration Non-Equivalent-MH, both adsorbed Cu atoms do not migrate during relaxation on all three of the monolayers. The binding energy of this adsorption mode is comparable to that of the Separated adsorption at M and H, due to the fact that Cu atoms do not agglomerate to form copper-copper bonds. This can be seen from the negligible metal-metal interaction energy of this configuration across all three monolayers.