Monte Carlo molecule-displacement from 1 layer to the other layer trial move for cluster integrals.
copied and modified from MCMoveClusterMolecule class
for virial coefficients calculation of phenanthrene and anthracene
for n = 4 , the molecules tend to form either 2 layers or 3 layers structures
add this monte carlo move, force one molecule to move out the existing layer to the other layer to explore more configurations
Method to perform trial move. Returns false if the trial could not be
attempted, for example if there were no molecules in the box and the
trial is designed to displace an atom; returns true otherwise.