  An ansatz is proposed for the coherent part of the single particle Green's
function in a doped resonant valence bond (RVB) state by, analogy with the form
derived by Konik and coworkers for a doped spin liquid formed by an array of
2-leg Hubbard ladders near half-filling. The parameters of the RVB state are
taken from the renormalized mean field theory of Zhang and coworkers for
underdoped cuprates. The ansatz shows good agreement with recent angle resolved
photoemission (ARPES) on underdoped cuprates and resolves an apparent
disagreement with the Luttinger Sum Rule. The transition in the normal state
from a doped RVB spin liquid to a standard Landau Fermi liquid, that occurs in
the renormalized mean field theory, appears as a quantum critical point
characterized by a change in the analytic form of the Green's function. A
d-wave superconducting dome surrounding this quantum critical point is
introduced phenomenologically. Results are also presented for the Drude weight
and tunneling density of states as functions of the hole density.
