Abstract
Orientational order-disorder transitions in simple diatomic molecular monolayers (such as N2 and O2 on different substrates) have been studied using various theoretical techniques. The nature of such a phase transition and physical mechanisms driving it are discussed for two types of systems; one with fixed centers of mass (CM) and the other where the CM-lattice structure is allowed to change at the phase transition. The latter provides a simple example of a ferroelastic phase transitions in 2 dimensions.
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