Touch the thumb of your right "A" hand to the left half of your
chest, then move it to the right side. The thumb doesn't drag along your
chest. It touches at the beginning of the sign then at the end. Also it
doesn't even need to touch. You can just bring the hand near the chest as if
you were going to touch it. If I'm signing slow and carefully, I make contact,
if I'm signing quickly and casually I don't make contact.
Here is Byron showing that you may see the sign Atlanta starting on
the right and moving to the left.