  In several jetted AGNs, structured jets have been observed. In particular
spine-sheath configurations where the jet is radially divided into two or more
zones of different flow velocities. We present a model based on the particle
and radiation transport code CR-ENTREES. Here, interaction rates and secondary
particle and photon yields are pre-calculated by Monte Carlo event generators
or semi-analytical approximations. These are then used to create transition
matrices, that describe how each particle spectrum evolves with time. This code
allows for arbitrary injection of primary particles, and the possibility to
choose which interaction to include (photo-meson production, Bethe-Heitler
pair-production, inverse-Compton scattering, $\gamma$-$\gamma$ pair production,
decay of all unstable particles, synchrotron radiation -- from electrons,
protons, and all relevant secondaries before their respective decays -- and
particle escape). In addition to the particle and radiation interactions taking
place in each homogeneous zone, we implement the feedback between the two zones
having different bulk velocities. The main mechanism at play when particles
cross the boundary between the two zones is shear acceleration. We follow a
microscopic description of this acceleration process to create a corresponding
transition matrix and include it in our numerical setup. Furthermore, each
zone's radiation field can be used as an external target photon field for the
other zone's particle interactions. We present here the first results of the
effect of a two-zone spine-sheath jet, by applying this model to typical
low-luminosity AGNs.
