Figure 3.

Dependence of D/G peak ratio, normalized to the maximum value encountered on the substrate, on the number of graphene layers (N). The data set combines results from graphene sheets from multiple silicon substrates. (N=∞ corresponds to graphite). 1/N (red) represents the expected D/G scaling with N if the topmost graphene sheets of multilayers have the same reactivity as that of single sheet. Calculations (green) of the reactivity normalized to graphite k/k_graphite for the case of no electronic puddles using Gerischer Marcus theory.