The experiments conducted by various scientic 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.