An extremely sensitive measuring system has been developed to obtain simultaneously heat capacity and optical reflectivity data from thin free-standing liquid crystal films. Results from 3(10)OBC near the smectic A to hexatic B transition will be reported and discussed in the context of recent theory regarding phase transitions in two dimensions.
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We are grateful to M. Kardar and M. Schick for valuable discussions. This work was supported in part by the National Science Foundation, Solid State Chemistry Program, Grant N. DMR89019334 and DMR9024992. Fellowship support from the Department of Education and I.B.M. (T.S.) is also acknowledged.
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