Science Advances

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• Fig. S1. Surface morphologies and cross sections of the wear tracks produced on amorphous carbon film surfaces after the friction tests as shown in Fig. 1 (G and H).
• Fig. S2. Evolution of EELS low-loss spectra recorded across the shallow shear band as marked in Fig. 4F and the derived E_p values through peak fitting.
• Fig. S3. STEM and EELS characterization of the wear track formed on a-C:H film surface after sliding against bare SUJ2 steel ball in humid air (ACF-1, Fig. 1H).
• Fig. S4. FIB slicing and TEM characterization confirming the variable thicknesses of the tribolayer in different contact positions of the wear scar formed on bare steel ball surface after sliding against a-C:H:Si film in humid air (ACF-6, Fig. 1H).
• Fig. S5. STEM and EELS characterization of the wear track formed on a-C:H:Si film surface after sliding against bare SUJ2 steel ball in humid air (ACF-6, Fig. 1H).

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