  The experiments conducted by various scientific groups indicate that, in
dense two-dimensional systems of elongated particles subjected to vibration,
the pattern formation is possible. Computer simulations have evidenced that the
random walk of rectangular particles in a discrete two-dimensional space can
lead to their self-organisation. We propose a technique for calculating the
entropy characteristics of a two-dimensional system in a discrete
two-dimensional space consisting of rectangular particles of two mutually
perpendicular orientations, and a change in these characteristics for a random
walk of particles is investigated.
