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That part!A decrease in interest rates makes return on investment in Australian assets less attractive to overseas investors (e.g. investing in Aus will give you say 10% return while say America gives you 15%), leading to a fall in financial inflow. This results in an increase in supply of $A, causing a depreciation. In other words, if Australia's interest rates are higher relative to overseas interest rates, it will lead to more financial inflow, greater demand for $A and therefore an appreciation. If Australian interest rates are lower relative to overseas interest rates, foreign assets become more attractive, leading to financial outflow. This increases supply of $A, leading to a depreciation.
Hope that helps but also echoing RishBonjour: feel free to correct me if I'm wrong!