In retrospect, the surface state kF , being an order of magnitude higher than for the kF of bulk, would give just as much smaller period for the former, which would not be able to explain the experimentally observed Li-Li distances. On the other hand, the FOs from the bulk electrons are decaying at a much higher rate than expected for the surface state FOs, being 1/r 5 55 and 1/r 2 , respectively. This explains the absence of longer Li chains. Interestingly, the authors have also noted that Li-Li pair may separate into two distinct Li adatoms via interaction with the STM tip. It appears that it is able to fill an electron state associated with the antibonding orbital that forms on Li atom via its adsorption. -