  Echo chambers and polarisation dynamics are as of late a very prominent topic
in scientific communities around the world. As these phenomena directly affect
our lives and seemingly more and more as our societies and communication
channels evolve it becomes ever so important for us to understand the
intricacies opinion dynamics in modern era. We build upon an existing echo
chambers and polarisation model and extend it onto a bi-layer topology. This
new topological context allows us to indicate possible consequences of
interacting groups within this model. Four different cases are presented -
symmetric negative and positive couplings, an asymmetric coupling and an
external bias. We show both simulation results and mean field solutions for
these scenarios outlining the possible consequences of such dynamics in real
world societies.Our predictions show that there are conditions in which the
system can reach states of neutral consensus, a polarised consensus, polarised
opposition and even opinion oscillations. Transitions between these states in
terms of bifurcation theory are identified and analysed using a mean field
model.
