§ 4159. Survivor benefits for certain former spouses
(b)
Time of election
(1)
If the participant or former participant has not retired under such system on or before February 15, 1981, an election under this section may be made at any time before retirement.
(c)
Portion of annuity as basis for benefits
An election under this section may provide for a survivor benefit based on all or any portion of that part of the annuity of the participant which is not designated or committed as a base for survivor benefits for a spouse or any other former spouse of the participant. The participant and his or her spouse may make an election under section
4046
(b)(1)(B) of this title prior to the time of retirement for the purpose of allowing an election to be made under this section.
(d)
Amount of reduction; effective date
The amount of the reduction in the participant’s annuity shall be determined in accordance with section
4046
(b)(2) of this title. Such reduction shall be effective as of—