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We study the signatures of a classical mixed phase space for open quantumsystems. We find the scaling of the break time up to which quantum mechanicsmimics the classical staying probability and derive the distribution ofresonance widths. Based on these results we explain why for mixed systems twotypes of conductance fluctuat ions were found: quantum mechanics divides thehierarchically structured chaotic component of phase space into two parts - oneyields fractal conductance fluctuations while the other causes isolatedresonances. In general, both types appear together, but on different energyscales.Comment: restructured and new figure

Conductance fluctuations of generic billiards: Fractal or isolated?