The tunnelling-states model is applied to the thermal conductivity of non-crystalline materials. It i s shown that the presence of a quadratic term in the energy dependence of the density of tunneling states, as implied by specific heat and ultrasonic measurements, can give rise near 10 K t o the plateau in the thermal conductivity which is characteristic of amorphous solids.Das Modell der "tunnelling-Etates" wird auf die Warmeleitung nicht -kristalliner Festkorper angewandt. Das Vorhandensein eines quadratischen Terms in der Energieabhangigkeit der Zustandsdichte der "tunnelling-states", das durch spezifische Warme-und Ultraschallmessungen nahegelegt wird, kann bei 10 K zu einem Plateau in der Warmeleitung fiihren, das fur amorphe Festkorper charaliteristisch ist.
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