Social Security Q re: Spousal Benefit

My spouse's full social security benefit is less than 50% of mine. If my spouse decides to start receiving her own social security now (age 62, 9 months), I understand that she will receive 75% of her maximum possible monthly payment (her full retirement age is 66). However, once I retire at my retirement age of 66, will my spouse be able to receive a full 50% of my maximum benefit... or will it be 75% of 50% of my maximum benefit?

I've looked in quite a few places but can't find a straight answer for this. Also, I'd appreciate it if you could post a link referencing where the answer to this question is coming from. Thanks in advance!