That's an advanced version of the Sutton Slice. I'd love to post the directions, but since they're copy-written for the book, you'll have to check them out there. There are some other advanced concepts for the technique also included among many others
I wasn't able to squeeze in my Faux Raku technique developed just before publication. Perhaps this will show up in the next clay book or an article. I'm teaching this in France at Corbieres Creatives II:
Glad the technique caught your eye.
Polymer Paradise Cruise 2010: www.artacrosstheoceans.com