I don't see how a PTC resistor can perform an inrush limiting function, since when power is initially applied, it will have a low impedance, which will rise when current starts flowing. An NTC resistor is used for inrush limiting, as it has a high resistance to start with which drops, when current starts flowing and it heats up.
A PTC resistor is normally used for over-current protection. The PTC resistor has a low impedance, when the circuit is working properly, then when the current exceeds a certain threshold, it heats up to the point, where its resistance increases, resulting in further heating, until the current is limited to a very low level.