Neel's theory is used to derive the expression describing the disaccommodation of the complex initial susceptibility in an alternating field in dependence on temperature, frequency of the field and concentration of relaxators. In addition to the disaccommodation of the real part the relaxation of the imaginary part of the initial susceptibility and that of the loss angle are predicted. The physical meaning of derived expressions have been discussed and the phenomena which can influence the aftereffect measurements have been mentioned.