I want an inverted breve that spans the width of two symbols rather than one.
I have tried the suggestions in: inverted breve accent in math mode , and in How to put \smallsmile or \smallfrown on top of a letter.
But these were meant for inverted breve oversets that only span the width of one symbol.
Those suggestions give the top result below, whereas what I want is the bottom result below:
What is the best way to do this ?