Kinda a chord/tab mix here for just one guitar, but I think it sounds quite close.
I based this off of the "IS Acoustic Sessions" recordings.
There are only two riffs, and otherwise it's all chords.

Riff 1
e|---------|
B|---------|
G|---------|
D|-0h2-0---|
A|-------3-|
E|---------|

Riff 2
e|--------------------|
B|--------------------|
G|----------0---------|
D|------0h2---2p------|
A|---0h3---------3----|
E|-1---------------3--|

Also, for all Fmaj7s, the G string is usually hammered on.



Capo 5

INTRO:

Am G Fmaj7 C
Am G Fmaj7

VERSE:

Am (x02210@1)            G (320003@1)            Fmaj7 (1x3210@1)  C"I'm (x32010@1)looking out the window of this big big, ship"

Am (x02210@1)          G (320003@1)          Fmaj7"and (1x3210@1)it's really coming down outside"

PRECHORUS:

Am (x02210@1)      G (320003@1)       Fmaj7 (1x3210@1)    "Somebody once told me"

G (320003@1)                                         (Riff1)  
     "You're gonna know right away"

CHORUS:

Am (x02210@1)           G (320003@1)   Fmaj7 (1x3210@1)   C"She (x32010@1)wears a ring already"
          Am (x02210@1)   G (320003@1)         Fmaj7C   
"She's steady in love with another man"

BRIDGE:

Am G Fmaj7   
"Your hand"

POST-BRIDGE:

Am (x02210@1)         G (320003@1)         (Riff2)
"She wears a ring"

ENDING:

Am G Fmaj7 C
Am G Fmaj7