  We consider a hierarchical nested microstructure, which also contains a point
of singularity (disclination) at the origin, observed in lead orthovanadate. We
show how to exactly compute the energy cost and associated displacement field
within linearized elasticity by enforcing geometric compatibility of strains
across interfaces of the three-phase mixture of distortions (variants) in the
microstructure. We prove that the mechanical deformation is purely elastic and
discuss the behavior of the system close to the origin.
