(a)
In addition to the increase in allowance authorized by and granted pursuant to Section 21313, and notwithstanding the limitation on such increases imposed by this article, the monthly allowance paid with respect to a state member, other than a school member, who retired or died prior to January 1, 1981, shall be increased by 4 percent.
(b)
The 4 percent shall be applied to the allowance payable on July 1, 1981, less the amount of the allowance paid pursuant to Section 21231,
and the allowance as so increased shall be paid for time on and after that date and until April 1, 1982. The base allowance shall be the allowance as so increased, less payments pursuant to Section 21231, for annual adjustments effective for time commencing on April 1, 1982.