Figure confirms this expectation. Therein, the location of the phase boundary for different electric fields is explicitly plotted. When fields F > 0 V nm -1 are applied, the boundary is shifted to higher temperatures. Reversing the field to F < 0 V nm -1 , we observe the boundary to move towards lower temperatures. The shape of the boundary remains qualitatively the same for all fields, with a slight increase in curvature for more intense fields F > 0 V nm -1 . In other words, a wider range of temperature/pressure combinations can be used to "trigger" the phase transition when applying these fields. Finally, it is worth noting, that the shift of phase boundary is quite substantial: According to our calculations the transition temperature can be varied by about 100 K for the pressure range of 1 × 10 -12 to 1 × 10 -3 mbar. As the predictions are somewhat dependent on the errors made by the prediction of the adsorption energies via SAMPLE, we provide an analysis of the error propagation in the supporting information.