This is an element output quantity for shell181 as shown in table 181.1 in the element reference for shell181:
The footnote 5 says you need to use OUTRES,LOCI,ALL
Then you can use "General Postproc > List Results > Element Solution > Geometry > Element integration point." I did this for one shell181 element 1 mm square with corner at origin in XZ plane:
Or use PRESOL,LOCI.
These were a fraction of 0.21132 along the side length, but this was for a square element.