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We present an angle resolved photoemission study of the surface and bulkelectronic structure of the single layer ruthenate Sr$_2$RuO$_4$. As the earlystudies of its electronic structure by photoemission and scanning tunnelingmicroscopy were confronted with a problem of surface reconstruction, surfaceaging was previously proposed as a possible remedy to access the bulk states.Here we suggest an alternative way by demonstrating that, in the case ofSr$_2$RuO$_4$, circularly polarised light can be used to disentangle thesignals from the bulk and surface layers, thus opening the possibility ofinvestigating many-body interactions both in bulk and surface bands. Theproposed procedure results in improved momentum resolution, which enabled us todetect an unexpected splitting of the surface $\beta$ band. We propose thatspin--orbit splitting might be responsible for this, and discuss possiblerelations of the newly observed surface feature to topological matter.

Surface and bulk electronic structure of unconventional superconductor Sr_2RuO_4: unusual splitting of the beta-band