  We determine the band structure and spin texture of WTe2 by spin- and
angle-resolved photoemission spectroscopy (SARPES). With the support of
first-principles calculations, we reveal the existence of spin polarization of
both the Fermi arc surface states and bulk Fermi pockets. Our results support
WTe2 to be a type-II Weyl semimetal candidate and provide important information
to understand its extremely large and nonsaturating magnetoresistance.
