This is how it goes:
You place your right hand in a normal playing position.
Your thumb is pointing the headstock, slightly angled,
then you pluck a string with the 2nd or 1st finger,
and pluck downwards with your thumb, with a gentle touch on the string.
Adventages:
1. Both your playing finger and your "touching" finger are moving - makes sense physically and rhythmically.
2. No need to adapt weird palm \ finger shapes \ positions:
(
http://www.youtube.com/watch?v=KYBGa...eature=related)
My Video:
http://www.youtube.com/watch?v=ydlwQRmoIVc