I watched the video of Thom Yorke and Jonny Greenwood of Radiohead covering this song.
This is what Thom appears to play.
http://www.youtube.com/watch?v=zPPH1qg8Qo4
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G|---------10-------------10-------------10-------------10------|
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[ Tab from: https://www.guitartabs.cc/tabs/p/portishead/the_rip_tab_ver_2.html ]
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A|--10------------10------------10------------9-----------|
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D|-----------7-----------7-----------7-----------7--|
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B|-----6-----------6-----------6-----------6--------|
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Repeat
-Adam