The computed binding energies for the metal adatoms on the different sites are given in Table and shown in Figure . The Cu adatom binding energy ranges from -2.88 eV at the most stable adsorption site (A) to -1.98 eV at the least stable adsorption site (C), with the binding energy at the remaining stable adsorption sites being closer to that of site C than site A. The Co adatom was also most stable at the A site, with a binding energy of -4.14 eV, and least stable on the C site, with a binding energy of -2.39 eV. Similar to Cu, the binding energies at the remaining sites are closer to site C, although the energy difference was slightly larger. The Ru adatom was also most stable at the A site, but least stable at the D site, and the range of computed binding energies is -5.40 eV to -3.96 eV. The binding energies for the Cu and Ru adatoms on TaN is consistent with previously reported values.