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Let's say I have a photo that is 1024 x 1024 pixels.  Now when I add an additional image that is also 1024x1024 it creates a new layer.  That's fine.  I usually perform this by just dragging an image from a file using something like MS Explorer and just drop it on top of the current layer. 

But when I do this I would like the image borders (the edges), need to match up exactly between layers.  Right now it seems to be  a "hit-n-miss".  It usually is off by 1 pixel and I have to manually adjust the corners to line up exactly.  That's ok for now but I plan to batch process 1,000's of these down the road which require exact placement. 

Is there a way to match up image layers automatically when one adds a new layer?

Thx

Clutch