Abstract
Birefringence measurements of $n$-hexyl 4\ensuremath{'}-$n$-pentyloxbiphenyl-4-carboxylate (650BC) near the smectic-$A$---hexatic-$B$ transition are reported. It is found that the anomalous part of the birefringence $\ensuremath{\delta}(\ensuremath{\Delta}n)$ due to long-range hexatic order exhibits a critical exponent 0.38 \ifmmode\pm\else\textpm\fi{}0.05. The relationship between $\ensuremath{\delta}(\ensuremath{\Delta}n)$ and the hexatic order parameter is discussed.
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