  In the beam pipe of the positron Main Damping Ring (MDR) of the Next Linear
Collider (NLC), ionization of residual gases and secondary electron emission
give rise to an electron cloud which can cause the loss of the circulating
beam. One path to avoid the electron cloud is to ensure that the vacuum wall
has low secondary emission yield and, therefore, we need to know the secondary
emission yield (SEY) for candidate wall coatings. We report on SEY measurements
at SLAC on titanium nitride (TiN) and titanium-zirconium-vanadium (TiZrV) thin
sputter-deposited films, as well as describe our experimental setup.
