Super-imposed means placing something on top of something else. Its antonyms would be removing, deconstructed, dismantled, unstacking, detaching, disassembling, and peeling off. These words suggest creating space or separating elements rather than putting them together. To un-superimpose, one may deliberately shift elements from the other, leading to dismantling or disassembling. On the other hand, removing suggests taking away an element that was placed on top. So, depending on the context, any of these antonyms can be used to convey the opposite of super-imposed.