The rare example of detailed studies of coordination complex adsorbed on Cu(111) has also been shown to lead to 1/r 2 decay, as expected for the noble metal surfaces . In this case the authors obtained a slightly different interaction potential curve. At close distances, dipole-dipole interaction between two tris-(2phenylpyridine)iridium(III) complexes greatly increases interaction energy. Only at high distances of >4 nm does the surfacemediated interaction prevail over dipole-dipole interaction potential energy, as can be seen from Fig 15. For this reason, the first interaction potential energy minimum does not coincide with the molecule separation predicted for solely surface-mediate interaction. However, already the experimental potential energy minimum at 2.59 nm is very close to the expected 2.75 nm separation.