e|----| O---2---3-2-O---O---2---3--5--7---O---2---3-2-O---O---2---O----|O
B|--O---O---O-------O---O---O---------O---O---O-------O---O---3---O--|
G|-------------------------------------------------------------------|
D|-------------------------------------------------------------------|
A|-------------------------------------------------------------------|
E|-------------------------------------------------------------------|

That is the main upper riff... here's the lower one:

E|-------------------------------------------------------------------|
B|-------------------------------------------------------------------|
G|-------------------------------------------------------------------|
D|----2---| O-----------------------------2---O------------------------|
A|------------3-2-3---2---| O---------------------3-2-3---O------------|
E|----------------------------3--2--| O-----------------------3-2-O----|H
                                                                 12

 Now you can mix those two so it looks something like this:

e|----| O---2---3-2-O---O---2---3-5-7---O---2---3-2-O---O---2---O---O-|
B|--O---O---O-------O---O---O-------O---O---O-------O---O---3---O---|
G|------------------------------------------------------------------|
D|----2---| O---------------------------2-----------------------------|
A|------------3-2-3---2---| O-------------------3-2-3---O-------------|
E|----------------------------3-2-0-----------------------3-2-| O---H-|

  That final harmonic is on the 12th fret.  I hope you can make
sense of this.  I don't know how to show the fingering I use.. but
I pick the top reps with only my index finger (when doing both
parts) and use my thumb for the bottom riff.  The positions I use
with my left hand are all index and middle finger and then thumb on
the 3-2-0 bottom E (You'll find that's a stretch to hit 2 and 5 on
opposite E's.. but it's not that hard at all... and once you play
this enough.. it's second nature.. and basic rhythm...