Several films of niobium were deposited on copper plates via the ultra-high vacuum cathodic arc (UHVCA) deposition method as described by R. Russo et al. [R. Russo et al., Supercond. Sci. Tech. 18 (2005) L41; R. Russo et al., J. Appl. Phys., submitted for publication]. We attached these end plates to a 6 GHz cavity operating in the TE011 mode for characterizing the film quality by measuring the Q versus surface magnetic field.