A logging tool, comprising: at least one transmit antenna for transmitting an electromagnetic signal; at least one receive antenna for receiving an electromagnetic signal; a controller (304,332), coupled to the at least one transmit antenna and the at least one receive antenna, that is configured to: measure a plurality of coupling parameters that represent a signal that has been received at the receive antenna in response to the electromagnetic signal from the transmit antenna, each of said coupling parameters being between the at least one transmit antenna and the at least one receive antenna, at least one of said coupling parameters being measured as a function of depth and azimuthal angle; characterized in that the controller (304, 332) is further configured to: determine if a surrounding formation is anisotropic and heterogeneous based at least in part on said at least one of said coupling parameters, and if so, the controller is configured to derive a dip angle from a partial derivative with respect to depth (z) and artificial dip angle (α) of at least one of said coupling parameters, wherein the artificial dip angle is an angle of rotation about an x-axis or a y-axis in a coordinate system and the z-axis of the coordinate system is aligned with the tool axis. at least one transmit antenna for transmitting an electromagnetic signal; at least one receive antenna for receiving an electromagnetic signal; a controller (304,332), coupled to the at least one transmit antenna and the at least one receive antenna, that is configured to: measure a plurality of coupling parameters that represent a signal that has been received at the receive antenna in response to the electromagnetic signal from the transmit antenna, each of said coupling parameters being between the at least one transmit antenna and the at least one receive antenna, at least one of said coupling parameters being measured as a function of depth and azimuthal angle; characterized in that the controller (304, 332) is further configured to: determine if a surrounding formation is anisotropic and heterogeneous based at least in part on said at least one of said coupling parameters, and if so, the controller is configured to derive a dip angle from a partial derivative with respect to depth (z) and artificial dip angle (α) of at least one of said coupling parameters, wherein the artificial dip angle is an angle of rotation about an x-axis or a y-axis in a coordinate system and the z-axis of the coordinate system is aligned with the tool axis. measure a plurality of coupling parameters that represent a signal that has been received at the receive antenna in response to the electromagnetic signal from the transmit antenna, each of said coupling parameters being between the at least one transmit antenna and the at least one receive antenna, at least one of said coupling parameters being measured as a function of depth and azimuthal angle; characterized in that the controller (304, 332) is further configured to: determine if a surrounding formation is anisotropic and heterogeneous based at least in part on said at least one of said coupling parameters, and if so, the controller is configured to derive a dip angle from a partial derivative with respect to depth (z) and artificial dip angle (α) of at least one of said coupling parameters, wherein the artificial dip angle is an angle of rotation about an x-axis or a y-axis in a coordinate system and the z-axis of the coordinate system is aligned with the tool axis. determine if a surrounding formation is anisotropic and heterogeneous based at least in part on said at least one of said coupling parameters, and if so, the controller is configured to derive a dip angle from a partial derivative with respect to depth (z) and artificial dip angle (α) of at least one of said coupling parameters, wherein the artificial dip angle is an angle of rotation about an x-axis or a y-axis in a coordinate system and the z-axis of the coordinate system is aligned with the tool axis.