  Melting of two dimensional (2D) clusters of classical particles is studied
using Brownian dynamics and Langevin molecular dynamics simulations. The
particles are confined by a circular hard wall or a parabolic external
potential and interact through a dipole or a screened Coulomb potential. We
found that with decreasing strength of the inter--particle interaction clusters
with short-range inter-particle interaction which are confined by a hard wall
exhibit a re-entrant behavior in its orientational order.
