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(a) FE-SEM micrographs of surfaces (scale bar = 300 nm), (b) topographic AFM images (scale bar = 2.5 µm), and (c) hypothetical images of the surfaces of bare Co-Cr, HA-DA50-coated Co-Cr, HA-DA100-coated Co-Cr, HA-DA250-coated Co-Cr, and HA-DA400-coated Co-Cr substrates.
