Outback Chemistry

Marvelling, on a rewatch today, at the relationship Robert Mitchum and Deborah Kerr conjure in The Sundowners (1960). This marriage is incredibly specific, and they give you their lived-in camraderie, their longstanding grievances, their happy-sex-life vibes, and even their future together constantly. 

What actors have wowed you in terms of conjuring authentic marriage vibes onscreen? 

Unrelated P.S.: It's a pity that Robert Mitchum only ever received one Oscar nomination in his career. His & hers would have not been untenable here and he very obviously should have been in the mix for Night of the Hunter (1955).