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XPS Cu 2p spectra of the Cu/Ce-Ln samples, where Ln: Gd, La, Pr, Nd, Sm (a); Gd 3d XPS spectra of Ce-Gd (b) and Cu/Ce-Gd (c); La 3d XPS spectra of Ce-La (d) and Cu/Ce-La (e); Nd 3d XPS spectra of Ce-Nd (f) and Cu/Ce-Nd (g); Pr 3d XPS spectra of Ce-Pr (h) and Cu/Ce-Pr (i); and Sm 3d XPS spectra of Ce-Sm (j) and Cu/Ce-Sm (k).
