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Representative SEM micrographs of the oxide layer cross-section of all PEO treated groups: a) 1-CaP5; b) 1-CaP10; c) 1-CaPAg5; d) 1-CaPAg10; e) 2-CaP5; f) 2-CaP10; g) 2-CaPSi5 and h) 2-CaPSi10. Average thickness values (μm) of the films are presented accordingly.
