  Turbulent boundary layers exhibit a universal structure which nevertheless is
rather complex, being composed of a viscous sub-layer, a buffer zone, and a
turbulent log-law region. In this letter we present a simple analytic model of
turbulent boundary layers which culminates in explicit formulae for the
profiles of the mean velocity, the kinetic energy and the Reynolds stress as a
function of the distance from the wall. The resulting profiles are in close
quantitative agreement with measurements over the entire structure of the
boundary layer, without any need of re-fitting in the different zones.
