Hi Paul,
Take a Master image a place it on Layer0.
Then take the image you want to align and have it on Layer1.
Then change the blend mode to Difference. You will notice the images go black except where there is mis-alignment. Now move Layer1 until all is Black. Images are now aligned. Change the Blend mode back to normat and set to 50% on Layer1. You have now stacked two images together & averaged the result.
Cheers
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