This is one of my favorite foundations to use. It creates an elastic foundation like the chainless foundation single crochet, but it is a bit thinner and depending on stitches used can be very decorative as well.
This foundation is just very short rows of crochet stitches worked to a specified length, then the main part of the crochet project is worked off the sides of the rows.
You can find a Photo Tutorial here on my blog: Pretty and Easy Foundation to help you with this foundation. I used this foundation in my “2 by 2 Cowl” pattern here on the blog as well.
For those of you that do better with a demonstration, check out my video from my YouTube channel: Crocheted Stacked Rows Foundation.