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Surface morphology (a,c,e) and cross-section images (b,d,f) of the (a,b) micro-arc oxidation (MAO)-treated, (c,d) MAO-4% PCL duplex-coated, and (e,f) MAO-7% PCL duplex-coated magnesium. Obtained from [67], with permission from Thin Solid Films, Elsevier, 2018.
