emperor tabbing question. Ye entrancemperium

[genocide roach]

ok, the 2nd riff of the song there is a sort of overtone. they are playing the open E chord and they have this high register overtone. they use that overtone chord quite a bit, as well as other bands. im wonder how its played. anyone know it? i cant find a tab of the song.

so if anyone can tell me how to play that overchord or give me a good tab of the song, that would be great.
thanks
~gR~