I was wondering if someone could help me with the finger placement for highway to hell. Just the opening riff bit please. There is a copy of the riff below.
I'm okay with the A chord bit in bar one but when it goes to the second bar I'm using my thumb to play the F# and G on the low E string, whilst trying to mute the A string, my little finger to play D on the B string and my middle finger to play A on the G string and I'm struggling with using my thumb. Is there a better way to arrange my fingers, so that I could be using one of my fingers to play the notes on the lower E?
Thanks.

1 + 2 + 3 + 4 + 1 + 2 + 3 + 4 + 1 + 2 + 3 + 4 + 1 + 2 + 3 + 4 +
e|-------------- --||------------------|-----------------|-----------------|
B|-----------2-2-2-||------------3-3-3-|-----------3-3-3-|---3-3-3---3---2-|
G|-----------2-2-2-||°-----------2-2-0-|-----------2-2-0-|---2-2-0---2---2-|
D|-----------2-2-2-||------------0-0-0-|-----------0-0-0-|---0-0-0---0---2-|
A|-----------0-0-0-||°-----------X-X-X-|-----------X-X-X-|---X-X-X---X---0-|
E|-----------------||------------2-2-3-|-----------2-2-3-|---2-2-3---2-----|