Haven't looked at the specific laws there but GENERALLY I would say this: Since his W has not been a SAHM the whole time and has her own retirement, the standard in most states is split each 50-50. Her share of his can cancel out his share of hers though, or at least reduce the amount she might be able to try and claim. He can also buy her out now instead of waiting til he retires.
Michelle - Proud DR Rockette S: 28JUL07, D'd: 29OCT09 http://tinyurl.com/27j9qo2