SNAP - StaMPS Workflow Documentation

[ABraun]

according to this comment, you can merge all interferogram pairs (and stacks) before using the StaMPS export:

Workflow between SNAP and StaMPS

Merge should be done after deburst (as indicated in the standard graph provided within SNAP) but individual IW interferograms should be ok, so I suggest you test individual IW interferograms before merging. This will be included in next snap2stamps release