Please note that by this definition, declaring an epiphenomenon to be real has absolutely no implications for ‘material reality’ that declaring it to be unreal doesn’t also have, and vice versa. In other words, it doesn’t exist relative to material reality at all.
Trying to use it to explain the properties of material reality is therefore pointless.
Oh, and before I forget: the definition of epiphenomenalism
Please note that by this definition, declaring an epiphenomenon to be real has absolutely no implications for ‘material reality’ that declaring it to be unreal doesn’t also have, and vice versa. In other words, it doesn’t exist relative to material reality at all.
Trying to use it to explain the properties of material reality is therefore pointless.