As in previous work, we define the volume as V = L x L y (H -2r C ), where r C is the van der Waals radius of carbon, 1.7 Å, H is the separation distance between the graphene layers, and L x and L y are the dimensions of the graphene sheet in the x-and y-directions, respectively. This choice of volume will influence the values of L ij but should not qualitatively affect any of the trends presented in this work (see Fig. , in which we show how each of the transport coefficients changes after a ±20% change in r C ).