  A new technical method is developed for soft x-ray spectroscopy of near-edge
x-ray absorption fine structure (NEXAFS). The measurement is performed with
continuously rotating linearly polarized light over 2$\pi$, generated by a
segmented undulator. A demonstration of the rotational NEXAFS experiment was
successfully made with a 2D film, showing detailed polarization-dependence in
intensity of the molecular orbitals. The present approach provides varieties of
technical opportunities that are compatible with the state-of-the-art
experiments in nano-space and under the $operando$ condition.
