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The evolution of the atomic coordination in the secondary oxide films after different cutting length: (a) 2 m length of cut; (b) 15 m length of cut. The blue oval indicates the long-range order region (EELFS Fourier transforms); (c) 30m cutting length, mullite-like tribo-oxides; (d) 60 m cutting length, sapphire-like tribo-oxides; (e) mullite-like and amorphous after length of cut of 100 m; and (f) tribo-oxides after length of cut of 100 m.
