  We have analyzed theoretically the photoemission spectra of the insulating
compound Li2VOSiO4.Recently, this compound has been proposed as the first
experimental realization of the frustrated J1-J2 Heisenberg model. Although it
is well known that Li2VOSiO4 is magnetically ordered in a collinear arrangement
below TN=2.8 K, there is some controversy about the coexistence of two
collinear phases above TN. Using a generalized t-J model we have obtained a
complex spectral structure that can be traced back to the underlying collinear
magnetic structures. We discuss the possibility to use ARPES experiments as a
way to discern among the different scenarios proposed in the literature.
