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请问RC隔直电路中相位偏移

现象是,固定电阻R=1M,改变电源频率f,或者缩小电容C,也就是改变电容的容抗,例如输入100hz,电容1nF,电阻1M,相位会发生偏移,加大电容量如1uF,相位偏移消失。知道电容电流超前电压,所以相位会偏移,这个偏移量是由什么决定呢?

相位偏移大小跟容抗跟阻抗的比值有关系,对吗,这个偏移量应该怎么计算呢?