Spousal equity and ownership rights

During the marriage a spouse shall acquire, based upon the factors set out in Section 20-3-620, a vested special equity and ownership right in the marital property as defined in Section 20-3-630, which equity and ownership right are subject to apportionment between the spouses by the family courts of this State at the time marital litigation is filed or commenced as provided in Section 20-3-620.