Grazing angle FTIR spectroscopy further confirmed the chemistry of the brushes generated (Figure and Supplementary Figure ). Bands typically associated with PSPMA brushes, including those corresponding to asymmetric sulfonate stretch near 1200 cm -1 and symmetric sulfonate stretching at 1045 cm -1 can be clearly seen in ARGET-initiated, as well as ATRP-initiated brushes, in addition to bands more broadly associated with methacrylate polymer brushes (C-H stretching bands near 2900 cm -1 , carbonyl stretching bands at 1730 cm -1 , CH2 bending vibrations near 1450-1500 and 740 cm -1 , and C-O stretching of esters at 1245 cm -1 ). Comparable spectra and vibrational features were observed for both ARGET-and ATRP-initiated brushes, but with distinct patterns, potentially reflecting the hydration state of the corresponding brushes, or their association with residual catalysts (ATRP-initiated brushes had not been cleared from complexes prior to FTIR characterisation). Overall, our data is confirming the chemistry of PSPMA brushes generated via ARGET, positioning this synthetic approach as particularly attractive for the coating of a wide range of interfaces with this polymer, in scalable formats.