bond with field changes qualitatively for upright standing molecules: The field dependence is now smaller than it was before. This is not quite unexpected, since packing molecules more densely generally increases the dielectric constant of the layer and reduces its polarizability. Interestingly, in the tightly packed layers the polarizability of both the upright standing and the flat-lying structures (given by the derivative of the energy with respect to the field) are approximately equal.