Alternating Cross Stitch is the name of a crossed canvas stitch where every other Cross Stitch is taller than the ones next to it.
In Mary Thomas's Dictionary of Embroidery Stitches, as well as in RSN's Stitch Bank, this stitch is also known as Double Stitch.
It's easy, as you can see in my photo tutorial. I used several colours for clarity, but you can, of course, use the same colour for every stitch.


