Folder Figure 1 -- Figure 1a: column 1 applied potential vs. Ag/AgCl reference electrode (in V), column 3 measured current (in A) Folder Figure 1 -- Figure 1b: column 1 measured current (in A), column 3 elpsed time (in s) Folder Figure 2 --- all txt files contain the instrument settings and titles identify the content of each column. Folder Figure 3 --- all txt files contain the instrument settings and titles identify the content of each column. Folder Figure 4 --- all txt files contain the instrument settings and titles identify the content of each column. Folder Figure 5 -- Figure 5a: column 1 binding energy (in eV), column 2 XPS intensity in eV, before normalization Folder Figure 5 -- Figure 5b: column 1 wavenumber (in cm-1), column 2 Raman intensity (arbitrary unit) Folder Figure 5 -- Figure 5c, 5d, adn 5e: raw data Moessbauer spectroscopy