def get_one_mask_layer(mask_layers, layer_name):
    """
    Returns the layer definitions that need to be suppressed.

    Args:
        mask_layers (list): The layers that need to be suppressed.
        layer_name (str): The name of target layer.

    Returns:
        Union[MaskLayerDes, None], the layer definitions that need to be suppressed.
    """
    for each_mask_layer in mask_layers:
        if each_mask_layer.layer_name in layer_name and not each_mask_layer.inited:
            return each_mask_layer
    return None