the coating reconstructs under sliding load to a lamellar FGO/Cu tribofilm, sliding against the fluorine-passivated steel counterface, it is this structure that provides the long-lasting, lowfriction performance (Figure ). This is beneficial for low-friction longevity as the fluorinerich transfer film is continually regenerated by the gradual wear and reconstruction of the FGO/Cu tribofilm, further retarding coating failure. The robustness of FGO-CMMC (0.25CD) at higher loads is attributed to the the improved ductility of the composite (c.f. pure copper) that further reduces the coatings' macroscale interlaminar shear strengths, allowing for a more efficient construction and mainteneance of the tribofilm during sliding.