I found this song on an album called "Beyond Mississippi" Various Artists

Open G tuning: DGDGBD

Thumb plays alternating bass and is damped by palm muting.
h=hammer on
s=slide

Riff.1
   h                     h
D|0/3---5-----5-----3---3/5-------|
B|--------------------------------|
G|--------------------------------|
D|5-------5-------5-------5-------|
G|----0-------0-------0-------0---|
D|--------------------------------|