The sign for stack is going to vary depending on what sort of stack you are talking about.
If you mean "to stack up" something -- then you should use an abbreviated mime type motion to dipict what the stacking process looks like.
If you mean a two or three feet high stack of something then use "B" hands (flat hands) or bent-B-hands to literally show the top and bottom of the stack.
If you mean a stack that extends up from the ground, just use the bent-hand version (not the index finger version) of the sign "TALL" to depict how high the stack is (or would be).
If you mean "stack" as in a stack of 100 dollar bills you can use a version of the sign for "thick."
THICK (Version: The thickness of something horizontal) (Facial expression here indicates "very" thick)
Now, if you are talking about a stack of ordinary paper (not a stack of something impressive like $100 bills) then you don't need to exaggerate your facial expression so much eh? (Unless you get excited about stacks of paper?!?)
"Stack" as in a "relatively thick" stack of something.
The facial expression for the above sign as based on showing a "relatively thick stack of papers." That mouth morpheme you are seeing means "fairly," "relatively," "substantial but not overwhelming." You might also see it on signs like 'so-so."
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ASL resources by Lifeprint.com © Dr. William Vicars
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