Fig. 2. (a) AFM tapping mode height image of a microstructured POEGMA brush, grown from chlorine-terminated regions of a photopatterned CMPTS layer (bars). The surface-grafted POEGMA chains are capped with NBC and the irradiated areas then functionalized using 2-bromoisobutyryl bromide. (b) Tapping mode height image of a binary brush pattern formed by ATRP of CysMA from the Br-functionalized regions (squares) of the patterned structure shown in (a) to form patterned PCysMA brushes. (c) Section through the images shown in (a) (red line) and (b) (blue line).