Applying the relationship between the spontaneous birefringence of ADP appearing in the low-temperature antiferroelectric phase with the spontaneous antipolarization, and taking into consideration the known experimental values for the quadratic and fourth-order electrooptic effects, an estimate is made of the lower limit of the spontaneous antipolarization. The estimation, which employs the fourth-order electrooptic effect, gives the antipolarization P = 1.2^.10^-2 Cm^-2, a value comparable in magnitude to the spontaneous polarization observed in ferroelectrics belonging to the KDP family of crystals.

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