We have calculated the thermal fluctuations in freestanding graphanol as a function of system size to explore its thermal stability, following the approach previously used for graphane and graphene. The squares of the out-of-plane displacements, w 2 i , for each atom i were calculated from 50 ps long (0.5 fs time step) MD simulations and used to quantify thermal fluctuations. We measured ⟨w 2 i ⟩ from N V T MD simulations run at T = 300 K for graphanol at system sizes of 400 to 22500 atoms, and compared with values for graphane, which we calculated for systems having the same number of carbon atoms using our previously developed DP for graphane. Results are plotted in Figure , where it can be seen that graphanol and graphane have similar ⟨w 2 i ⟩ values. The fits to the log transform of the