What is the standard name of the effect used in this image?

Question

I need to make something similar as the poster below original site. Any references on how can I go about achieving something of this kind in Adobe Photoshop or GIMP?

Asked by user1235555

Answer

I guess each person is on one layer. Whichever is in front has a "well-designed" alpha channel: Where the background person is to show, it is fully transparent, whereas it is opaque where it should appear in front.

Answered by subsub

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