I believe it is untrue as stated near the end of this article that Alexander Rice married Angelica Talcott Devins Powell as his second wife. Her Mt. Auburn gravestone says her second husband was Henry, NOT his brother Alexander.
https://www.findagrave.com/memorial/85689649/angelica-talcott-rice
I know you can find multiple sources on-line that repeat the information in this article, but it's hard to believe that the gravestone photograph lies.
Using FamilySearch, I've found no evidence that Alexander Rice married more than once.
I lack the knowledge to correct this, so I hope it's OK to leave it to those who know what they're doing.