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The interfacial composition of plasma‐assisted chemical vapor deposited TiN films on M2 tool steel is reported. An in situ scratcher with a scratch adhesion test type diamond stylus was used to create scratches in ultrahigh vacuum (UHV). Auger electron spectroscopy analysis of the adhesive mode failures revealed a sharp chlorine concentration gradient at the exposed surface representing the prior interface. The scratch removal technique data is compared to sputter depth profile data. Scanning electron microscopy and energy dispersive spectroscopy investigation of the scratches following the UHV work is also presented and discussed.