Abstract
Localized low-energy excitations dominate many low-temperature properties of amorphous solids. Their existence in amorphous metals is well established /1/. In the tunneling model /2/, these excitations are viewed as two level systems (TLS) arising from tunneling of single atoms or small groups of atoms between the two wells of a double well potential. This model describes many experiments successfully, in particular the coupling of TLS to phonons as is observed,e.g.,in the thermal conductivity. Unfortunately, however, the microscopic nature of the TLS is not known.
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