When cheryl looks across the room, she sees part of her husband, but the couch is in front of him, obscuring her view of his legs. cheryl understands that this means that her husband is more distant from her than the couch is. cheryl is using the depth cue of?

The answer to this question is interpostion
In psychology, interposition refers to the overlapping objects that caused someone experience perception of  depth.
When a first object is blocking the view of second object, we could directly knew that the second object is located the furthest because the reflection of second's object is intercepted by the reflected of the first object

United states v.  nixon, 418  u.s.  683 (1974),  was  a landmark  united states supreme court case  that resulted in a unanimous  decision  against president richard  nixon, ordering him to deliver tape recordings  and  other subpoenaed materials to a  federal  district  court.