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Abstract
After a short discussion of previous data on transport properties along grain boundaries in germanium bicrystals it is pointed out that the system is suitable to study the metal-insulator transition. Complications in the interpretation of transport data arise because the conducting layers are p-type and two-dimensional. The magneto-transport data of space charge layers adjacent to tilted grain boundaries show anomalous behaviour which can be attributed to electron-electron interaction effects. Under usual conditions in [100] medium angle tilted bicrystals two hole subbands are occupied. This is the result of self-consistent subband calculations in the Hartree approximation.
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