  We consider the quasiperiodic Aubry-Andr\'e chain in the insulating regime
with localised single-particle states. Adding local interaction leads to the
emergence of extended correlated two-particle bound states. We analyse the
nature of these states including their multifractality properties. We use a
projected Green function method to compute numerically participation numbers of
eigenstates and analyse their dependence on the energy and the system size. We
then perform a scaling analysis. We observe multifractality of correlated
extended two-particle bound states, which we confirm independently through
exact diagonalisation.
