The Rapid Communications section is intended for the accelerated publication of important new results S. tnce manuscripts submitted to this section are given priority treatment both in the editorial once and in production, authors should exp/at n'in their submittal letter why the work justijies this special handling A.The optical anisotropy of Bi2Sr2CaCu208 in the 0.08-0.5 eV region is investigated by polarized reflectance measurements on single crystals. A very large anisotropy is found in this spectral region. The in-plane reflectance exhibits metallic behavior, while the c-axis reflectance exhibits insulatorlike behavior. This result is consistent with the large anisotropy found in the resistivity of Bi2Sr2CaCu208. Our spectroscopic data suggest that Bi2Sr2CaCu208 is a quasi-two-dimensional metal similar to La2-~Sr Cu04.
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