Abstract
The splitting of the $\ensuremath{\pi}$ bands in graphite due to multilayer interaction has been observed directly for the first time for the valence-band states at $P$ and $Q$ on the vertical face of the Brillouin zone, using photoemission techniques. The splitting is found to be 0.8\ifmmode\pm\else\textpm\fi{}0.1 eV for both $P$ and $Q$, giving a value of 0.42 eV for the parameter ${\ensuremath{\gamma}}_{1}$, in agreement with other experiments.
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