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2. C. G. B. Garrett and R. F. Merritt, Appl. Phys. Letters 4, 31 (1964).APPLAB0003-6951
3. V. Ranon and V. Volterra, Phys. Rev. 134, A1483 (1964).PHRVAO0031-899X
4. K. Nassau, Phys. Chem. Solids 24, 1510 (1963).
5. We use the abbreviation “electric effect” to describe the shifts in g2 which are linear in applied electric field as described in Sec. II. “Quadratic electric effect” refers to shifts in g2 which involve the second power of the odd field.