You mean Alexander Ferguson Fleming born 1914 in Carluke the 7th child, 2nd son of son of Alexander/Isabella Ferguson. He married Grace Wilson in 1942 who died in 1946. He remarried around 1950 but we do not know if he married a third time, let alone his 2nd wife's name. He died 1998 in Whitburn.
Or...do you mean one of the other Alexander Ferguson Fleming's. Yes there were several.
I don't have enough on this branch to confirm it is the same man. My cutoff date is 1925 and the above marriage/death came from a family member who is in touch with that side of the family.
You would need to obtain her marriage registration which shows both parents to confirm your Alexander's identity.
Don