  The magnetorotational instability (MRI) (Balbus and Hawley 1991, Hawley and
Balbus 1991) transports angular momentum radially outwards in accretion discs
through the distortion of the magnetic field lines that connect fluid elements.
In protostellar discs, low conductivity is important, especially in the inner
regions (Gammie 1996, Wardle 1997). As a result, low k modes are relevant and
vertical stratification is a key factor of the analysis. However, most models
of the MRI in these environments have adopted either the ambipolar diffusion or
resistive approximations and have not simultaneously treated stratification and
Hall conductivity. We present here a linear analysis of the MRI, including the
Hall effect, in a stratified disc.
