This is usually not a problem. For Tesla work, however, it is desirable for the resistance to be very low. Also, thick plates are better than thin. Any conductor, even the metal plates of a capacitor, will have inductance. This is because whenever a current flows through a conductor, a magnetic field is set up.
Energy is stored in the magnetic field, and that constitutes inductance.
Of course the inductance of the metal plates in a capacitor is usually negligable, but if the capacitor is of a 'rolled' construction, as is sometimes used for Tesla Capacitors, then the inductance can be significant. At low frequencies even the inductance of a 'rolled' capacitor is insignificant, but at the high frequencies used in a Tesla Tank circuit, the inductance can present a high inductive reactance. High inductive reactance is undesirable, as it limits the 'ringing' current that will flow in the Primary Tank circuit. This is because long rectangular plates have higher inductance. Types of Tesla Coil Primary Tank Capacitor.