  Two solid phases of cyclohexane have been investigated over a temperature
range spanning 13 to 266 K on a powdered, perdeuterated sample using neutron
total scattering. Phase II has an ordered structure (C2/c) that forms below 186
K. Between 186 and 280 K it exists as a plastic solid - phase I (Fm3m), where
the molecules are rotationally disordered about the lattice points of the
face-centred cubic cell. Data-dependent atomistic configurations that represent
the 'instantaneous' crystal structure have been generated from the total
scattering data using Reverse Monte Carlo refinement. Analysis of local
structure reveals that instantaneous distortions in phase I resemble the
average structure of phase II.
