  We prove a representation of the partial autocorrelation function (PACF) of a
stationary process, or of the Verblunsky coefficients of its normalized
spectral measure, in terms of the Fourier coefficients of the phase function.
It is not of fractional form, whence simpler than the existing one obtained by
the second author. We apply it to show a general estimate on the Verblunsky
coefficients for short-memory processes as well as the precise asymptotic
behaviour, with remainder term, of those for FARIMA processes.
