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In his comment on [1], V. J. Stepanov has presented a new expression for the flow-induced correction to the one-particle distribution function in nematic liquid crystals. With the help of this solution he obtained a simple expression for the rotational viscosity yx which does not possess the exponential temperature dependence related to the overcoming a potential barrier, contrary to results of [1], From the physical point of view this means that the rotating mesogenic molecule does not overcome the mean field potential barrier but prefers to rotate around the director. We accept the mathematical arguments of the Comment and agree that the approximate solution of the stationary Fokker-Planck equation, proposed in [1] (see (2) of the Comment) appears to be incorrect close to singularity point due to the wrong assumption that the last term in the equation can be neglected. At the same time one can not accept the statement of Stepanov that this is a revision of the main result of [1]. In fact, it was shown in [1] that the experimental observed exponential temperature variation of the rotational viscosity of nematics can not be determined by the overcoming of the mean-field potential barrier but is related to the activation-like temperature dependence of the "molecular friction" coefficient L This coefficient is the parameter of the mean-field theory, and it was calculated in [1] using the more general correlation function approach. This general conclu-

Notizen: Reply to the Comment of V. I. Stepanov “On the Osipov-Terentjev Calculation of the Viscosity of Liquid Crystals”