AFM derived roughness values (R_q/R_a) for SNAP coated substrates. Values represent the mean value obtained from three measurements on three separate areas of the substrate.

Control		2 w/v%		4 w/v%		4 w/v% OC
R q	R a	R q	R a	R q	R a	R q	R a
6.87 ± 1.42	5.37 ± 1.08	236.6 ± 25.4	189.3 ± 22.1	442.3 ± 107	341.3 ± 82.1	467.6 ± 99.4	378.6 ± 89.6