Detailed analysis of transport, magnetism, and x-ray absorption spectroscopy measurements on ultrathin La 0.7 Sr 0.3 MnO 3 films with thicknesses from 3 to 70 unit cells resulted in the identification of a lower critical thickness for a nonmetallic nonferromagnetic layer at the interface with the SrTiO 3 ͑001͒ substrate of only three unit cells ͑ϳ12 Å͒. Furthermore, linear-dichroism measurements demonstrate the presence of a preferred ͑x 2 -y 2 ͒ in-plane orbital ordering for all layer thicknesses without any orbital reconstruction at the interface. A crucial requirement for the accurate study of these ultrathin films is a controlled growth process, offering the coexistence of layer-by-layer growth and bulklike magnetic/transport properties.

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