It is important to note that in reality the plasma polymerisation process results in a mixture of molecular monomers and a mixture of macromolecular chains of varying length and varying degrees of molecular fragmentation. As discussed in detail elsewhere , mass spectrometry confirms that the plasma conditions primarily produce intact monomers, however, there will also be a distribution of fragmented monomers with varying degrees of damage in the NO and methyl groups (which facilitate molecular polymerisation). It is therefore clear that the modelling presented here will not fully capture the complexity of the TEMPO polymer system, nevertheless, we believe it serves as a good approximation considering the expected monomer dominated composition of the film.