This song is called: 
    The Last Thing on My Mind.  
    Try doing this riff with just fingers -
    thumb and your choice of fingers. (Merle Watson
    style)     
    You can also hybrid pick it using the
    flatpick and fingers. 

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m=middle finger
r=ring finger
p=pinky finger

d=down with pick
u=up with pick


    Key: G  

      G            C        G                C       G         D        G
                                               h p
E ||----------------0-3------0-----------------/\/\------------------------------3------|
B ||--0-1-3---0-3--------1-----3-------0------1-3-1--0----0----------0------------------|
G ||-------------------------------3----------------------------0h2------0----0---------|
D ||----0---0---0-----2----2---0-----0---0-------2-----0---0----0------0---0---0---3----|
A ||----------------3---3---------------------3-----------------------------------------|
E ||--3---3---3---3----------3---3-----3-------------3---3----2-----2----3---3---3------|


   D                             C       G       C         G        D               G
       h   p
      /\ /  \
E ||--1-2-1-0-----0------5---------3-----0----------3------0--------------------0------------------|
B ||----------3-------5/7---7---------1----3-----------1-----3-----------0--1---------0---0h1---0--|
G ||------------------------------------------0-----------------0----0h2---------------------------|
D ||-------0--------0----0---0-----2---2---0---0----2---2----0---0---0----0---0---0---0---0-0h2----|
A ||--0---------0-----0----0-----3---3------------3---3--------------------------------------------|
E ||-------------------------------------3---3-------------3---3----2---2---0---2----3--3-------3--|