Fig. 3

XPS survey spectra. The data were obtained for the clean \(\hbox{{Au}(111)}\) sample and the low-coverage \(\hbox{Sn}\)-phases. The measurements were taken at \(\hbox{h}\nu ={700}\,\hbox {eV}\) and at \(\Theta ={60}^{\circ }\) emission angle. The binding energy of the spectra was referenced to the Fermi edge.