  We study the thermal transition of QCD with two degenerate light flavours by
lattice simulations using $\mathcal{O}(a)$-improved Wilson quarks. Particular
emphasis lies on the pattern of chiral symmetry restoration, which we probe via
the static screening correlators. On $32^3$ volumes we observe that the
screening masses in transverse iso-vector vector and axial-vector channels
become degenerate at the transition temperature. The splitting between the
screening masses in iso-vector scalar and pseudoscalar channels is strongly
reduced compared to the splitting at zero temperature and is actually
consistent with zero within uncertainties. In this proceedings article we
extend our studies to matrix elements and iso-singlet correlation functions.
Furthermore, we present results on larger volumes, including first results at
the physical pion mass.
