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XPS measurements for PA6 coated with a-C:H layers of various thickness. The content of the sp2 (black squares) and sp3 (red circles) bound carbon are plotted against layer thickness: (A) thin layers from raw PA6 (ref) and O2-cleaned material (represents a layer thickness of 0 nm) to 100 nm and (B) thicker layers up to 2000 nm (the dashed line only indicates a trend). The gray box indicates the region before a-C:H coating (0 nm layer thickness).
