I think you're using "married segments" a little outside its normal context. It's usually used to describe the situation where the airline provides different availability numbers than the segment-by-segment numbers. But maybe that's what you were saying? Otherwise, I think that you're just talking about "legal transfers" within a fare rather than needing to talk about "married segments."

In any case, United.com does it's best to avoid showing you two-stop itins, even when they're cheaper.