Page 50 - Peter Randall "The Craft of the Knot.."

If the size difference between the two ropes is too much, or if the tying
materials are slippery, the Double Sheet Bend (see previous) may
provide more security.

SLIPPED SHEET BEND

This bend is a modified version of the Sheet Bend (see previous). In this
particular bend, the last tuck is made with a bight instead of a single
running end.

STEP 1 Follow Step 1 for tying the Sheet Bend. As you move to Step 2,
double up the running end and use the bight to move through the loop

and under itself.

STEP 2 You can also tie a Slipped Bend by taking an extra turn around
the knot before tucking the bight.

The Slipped Sheet Bend is at least as secure as the regular Sheet Bend,
but with the added convenience of having quick release. The alternate

slipknot shown in Step 2 can be useful when there is a larger difference
in rope sizes.