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High-resolution ac calorimetry has been used to characterize the excess heat capacity ⌬C p (T) associated with the smectic-A (SmA) -hexatic-B (HexB) transition in n-hexyl-4Ј-n-pentyloxybiphenyl-4-carboxylate ͑65OBC͒. For temperature oscillations in the investigated frequency range 1.42-400 mHz, the ⌬C p data reveal no frequency dependence and correspond to static thermodynamic values. The present data resolve several discrepancies in previously reported C p values. This transition is verydoi:10.1103/physreve.56.1808 fatcat:2qmajscn2rerdb2wvln4vkm4qm