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Josephson effect in junctions between unconventional superconductors isstudied theoretically within the model describing the effects of interfaceroughness. The particularly important issue of applicability of the frequentlyused Sigrist-Rice formula for Josephson current in d-wave superconductor /insulator / d-wave superconductor junctions is addressed. We show that althoughthe SR formula is not applicable in the ballistic case, it works well for roughinterfaces when the diffusive normal metal regions exist between the d-wavesuperconductor and the insulator. It is shown that the SR approach only takesinto account the component of the d-wave pair potential symmetric with respectto an inversion around the plane perpendicular to the interface. Similarformula can be derived for general unconventional superconductors witharbitrary angular momentum l.Comment: 4 pages, 4 figure

Angular dependence of Josephson currents in unconventional superconducting junctions