Fig. 4

Analysis of the internal structure of the different structural phases using high-resolution XPS spectra of the \(\hbox{Sn}\,\hbox{4d}\) core level. The spectra were taken at a photon energy of \(\hbox{h}\nu ={240}\,\hbox {eV}\) under emission angles of \(\Theta ={0}^{\circ }\) and \(\Theta ={60}^{\circ }\) in the top and bottom row, respectively. Table 2 presents the corresponding fit parameters.