It is interesting to note that these 2D structures, while having a smaller binding energy and metal-metal interaction energy than the 3 and 4 atom clusters, have a larger metal-surface interaction energy. There is competition between maximising metal-surface energies and metal-metal energies. However, the magnitude of metalmetal interaction energies is much larger than that of metal-surface energies, with the largest metal-surface energy being -0.85 eV (Te-Wire-H) and the largest metalmetal interaction energy being -1.61 eV (S-Rhombus-X).