  We conjecture that chaotic resonance modes in scattering systems are a
product of a conditionally invariant measure from classical dynamics and
universal exponentially distributed fluctuations. The multifractal structure of
the first factor depends strongly on the lifetime of the mode and describes the
average of modes with similar lifetime. The conjecture is supported for a
dielectric cavity with chaotic ray dynamics at small wavelengths, in particular
for experimentally relevant modes with longest lifetime. We explain scarring of
the vast majority of modes along segments of rays based on multifractality and
universal fluctuations, which is conceptually different from periodic-orbit
scarring.
