You create a big canvas and paste both pages as different layers.
Then select both and use "Edit /Auto Align Layers" and maybe also "Edit/Auto merge Layers".
But in order to be able to merge the layers you need to make each page overlap the other one. Means: Scan a double page and leave like 15% of the other page in the picture. Get what I mean?
If you don't do that PS will not be able to recognize how to merge the pages!
cheers,
hartwig
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