  Recent cantilever magnetometry measurements of annular micron-size samples of
Sr2RuO4 have revealed evidence for the existence of half-quantum vortices
(HQVs) in this material [Jang et al. 2011]. We propose to look for HQVs in
transport measurements and calculate magnetoresistance of a perforated
superconducting film close to the transition temperature in the presence of
HQVs. We analyze the dependence of magnetoresistance on the thermodynamic
stability of HQVs which according to [Jang et al. 2011] can be varied by the
application of an in-plane magnetic field and point out features which may help
to identify them.
