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¤ where � � � � � � � � � � and are the density and vertical slowness in the and� water-layer is the horizon- � tal rayparameter. � � � � To resolve the criterion that there should be no primary reflections present in the decomposed downgoing wavefield above (© � the bottom ) is applied. Stage 3. Elastic into� � ¦ ¦ decomposition just below the bottom The next stage is an elastic decomposition below the bottom into up- and downgoing normal stressfields: where ¤ � and � ¡ �� � � � � �