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Despite extensive Monte Carlo ͑MC͒ simulations, the nature of the phase transition in the anisotropic planar rotor ͑APR͒ model remains elusive. The ground state is sixfold degenerate, which would naively suggest strongly first-order qϭ6 Potts behavior. Extensive MC simulations indicate either a second-order transition with qϭ3 Potts exponents, or a very weakly first-order transition. We show that the APR model maps to a generalized six-state Potts model, with a bond energy between pairs ofdoi:10.1063/1.1367285 fatcat:6fjmgteas5cxlfvrovzr7ta2cy