Survey and detail spectra were measured in fixed analyzer transmission mode while choosing a pass energy of 20 eV (step size of 0.5 eV) for the survey and 10 eV (step size of 0.05 eV) for the core levels. The system was calibrated to 0.00 eV binding energy of the Fermi level of sputter-cleaned Au and Cu as well as to the emission lines of Au 4f7/2 at 83.98 eV, Ag 3d5/2 at 368.26 eV, and Cu 2p3/2 at 932.67 eV binding energy with deviations ≤0.1 eV. The data analysis was performed with CasaXPS, version 2.3.18. The core level spectra were fitted with a Shirley background and peaks of a GL(30) line shape.