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A simple planar model for an orientational ordering of threefold molecules ona triangular lattice modelling a close-packed (111) plane of fullerite isconsidered. The system has 3-sublattice ordered ground state which includes 3different molecular orientations. There exist 6 kinds of orientational domains,which are related with a permutation or a mirror symmetry. Interdomain wallsare found to be rather narrow.  The model molecules have two-well orientational potential profiles, which areslightly effected by a presence of a straight domain wall. The reason is astronger correlation between neighbour molecules in triangular lattice versuspreviously considered square lattice  A considerable reduction (up to one order) of orientational interwellpotential barrier is found in the core regions of essentially two-dimentionalpotential defects, such as a three-domain boundary or a kink in the domainwall. For ultimately uncorrelated nearest neighbours the height of theinterwell barrier can be reduced even by a factor of 100.Comment: 11 pages, 13 figures, LaTeX, to appear in Low Temperature Physic

On the orientational relief of the intermolecular potential and the structure of domain walls in fullerite C60