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The effect of orthorhombicity on Josephson tunneling in high T$_c$superconductors such as YBCO is studied for both single crystals and highlytwinned crystals. It is shown that experiments on highly twinned crystalsexperimentally determine the symmetry of the superconducting twin boundaries(which can be either even or odd with respect to a reflection in the twinningplane). Conversely, Josephson experiments on highly twinned crystals can notexperimentally determine whether the superconductivity is predominantly$s$-wave or predominantly $d$-wave. The direct experimental determination ofthe order-parameter symmetry by Josephson tunneling in YBCO thus comes from therelatively few experiments which have been carried out on untwinned singlecrystals.Comment: 5 pages, RevTeX file, 1 figure available on request  (walker@physics.utoronto.ca

physical review. b, condensed matter

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Orthorhombically mixeds- anddx2−y2