We have investigated a non-metal-metal transition, novel in-plane orde
ring and STM imaging contrast, all of which evolve as a function of Pb
concentration in the two-dimensional solid solution GexPb1-x/Ge(111).
The cause of these is a local charge rearrangement between the surfac
e Pb and Ce adatoms. (C) 1998 Elsevier Science B.V. All rights reserve
d.